Datasheet

-WAIT
(PC Card Memory Mode)
-WAIT
(PC Card I/O Mode)
IORDY
(True IDE Mode – Except
Ultra DMA Mode)
-DDMARDY
(True IDE Mode – Ultra DMA
Write Mode)
DSTROBE
(True IDE Mode – Ultra
DMA Read Mode)
O
42 The -WAIT signal is driven low by the CompactFlash Storage Card to signal the
host to delay completion of a memory or I/O cycle that is in p rogress.
This signal is the same as the P C Card Memory Mode signal.
In True IDE Mode, except in Ultra DMA mod es, this output signal may be used as
IORDY.
In True IDE Mode, when Ultra DMA mode DMA Write is active, this signal is
asserted by the host to indicate that the device is read to receive Ultra DMA
data-in bursts. The device may negate -DDMARDY to pause an Ultra DMA
transfer.
In True IDE Mode, when Ultra DMA mode DMA Write is active, this signal is the
data out strobe generated by the device. Both the rising and falling edge of
DSTROBE cause data to be latched by the host. The device may stop generating
DSTROBE edges to pause an Ultra DMA data-out burst.
-WE
(PC Card Memory Mode)
-WE
(PC Card I/O Mode)
-WE
(True IDE Mode)
I
36 This is a signal driven by the host and used f or strobing memory write data to the
registers of the CompactFlash Storage Card when th e card is configured in the
memory interface mode. It is also used for writing the configuration registers.
In PC Card I/O Mode, this signal is used for writing the configuration registers.
In True IDE M ode, this input signal is not u sed and should be connected to VCC
by the host.
WP
(PC Card Memory Mode)
Write Protect
-IOIS16
(PC Card I/O Mode)
-IOCS16
(True IDE Mode)
O
24
Memory Mode – Th e CompactFlash Storage Card does not have a write protect
switch. This signal is held low after th e completion of the reset initialization
sequence.
I/O Operation – When the CompactFlash Storage Card is configured for I/O
Operation Pin 24 is used for the -I/O Selected is 1 6 Bit Port (-IOIS16) function. A
Low signal indicates that a 16 bit or odd byte only operation can be performed at
the addressed port.
In True IDE Mode this output signal is asserted low when this device is expecting
a word data transfer cycle.
Electrical Specification
The following tables indicate all D.C. Characteristics for the CompactFlash Storage Card. Unles s
otherwise stated, conditions are:
Vcc = 5V ±10%
Vcc = 3.3V ± 5%
1. Absolute Maximum Conditions